================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in ip6mr_sk_done+0x11b/0x410 net/ipv6/ip6mr.c:1578 Read of size 4 at addr ffff88807690a488 by task kworker/u4:3/54 CPU: 0 PID: 54 Comm: kworker/u4:3 Not tainted 5.17.0-rc2-syzkaller-00650-g5a8fb33e5305 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] ip6mr_sk_done+0x11b/0x410 net/ipv6/ip6mr.c:1578 rawv6_close+0x58/0x80 net/ipv6/raw.c:1201 inet_release+0x12e/0x280 net/ipv4/af_inet.c:428 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:478 __sock_release net/socket.c:650 [inline] sock_release+0x87/0x1b0 net/socket.c:678 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] igmp6_net_exit+0x6b/0x170 net/ipv6/mcast.c:3173 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:600 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 3610: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] fib_create_info+0xdbb/0x4ac0 net/ipv4/fib_semantics.c:1442 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1087 fib_add_ifaddr+0x395/0x500 net/ipv4/fib_frontend.c:1122 fib_netdev_event+0x462/0x680 net/ipv4/fib_frontend.c:1466 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8177 dev_change_flags+0x112/0x170 net/core/dev.c:8215 do_setlink+0x96d/0x3a10 net/core/rtnetlink.c:2729 __rtnl_newlink+0xdf5/0x1760 net/core/rtnetlink.c:3414 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3529 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5594 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 __sys_sendto+0x21c/0x320 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 54: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x130/0x160 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xcb/0x280 mm/slub.c:4562 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:600 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3106 free_fib_info net/ipv4/fib_semantics.c:255 [inline] fib_create_info+0x220a/0x4ac0 net/ipv4/fib_semantics.c:1573 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1087 fib_add_ifaddr+0x395/0x500 net/ipv4/fib_frontend.c:1122 fib_netdev_event+0x462/0x680 net/ipv4/fib_frontend.c:1466 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8177 dev_change_flags+0x112/0x170 net/core/dev.c:8215 do_setlink+0x96d/0x3a10 net/core/rtnetlink.c:2729 __rtnl_newlink+0xdf5/0x1760 net/core/rtnetlink.c:3414 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3529 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5594 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 __sys_sendto+0x21c/0x320 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88807690a400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 136 bytes inside of 256-byte region [ffff88807690a400, ffff88807690a500) The buggy address belongs to the page: page:ffffea0001da4280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7690a head:ffffea0001da4280 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c41b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3610, ts 55207365292, free_ts 55204153034 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87c/0xe90 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x2fb/0x340 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] fib_create_info+0xdbb/0x4ac0 net/ipv4/fib_semantics.c:1442 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1087 fib_add_ifaddr+0x476/0x500 net/ipv4/fib_frontend.c:1129 fib_netdev_event+0x462/0x680 net/ipv4/fib_frontend.c:1466 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8177 dev_change_flags+0x112/0x170 net/core/dev.c:8215 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3404 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6d/0x160 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x1e9/0x2c0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] ref_tracker_alloc+0x14c/0x560 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:3847 [inline] dev_hold_track include/linux/netdevice.h:3876 [inline] dev_hold_track include/linux/netdevice.h:3871 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1650 [inline] netdev_queue_update_kobjects+0x1a7/0x4e0 net/core/net-sysfs.c:1705 register_queue_kobjects net/core/net-sysfs.c:1766 [inline] netdev_register_kobject+0x35a/0x430 net/core/net-sysfs.c:2012 register_netdevice+0xd31/0x1520 net/core/dev.c:9667 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x3c3/0x520 drivers/net/netdevsim/netdev.c:365 __nsim_dev_port_add+0x2bb/0x7c0 drivers/net/netdevsim/dev.c:1392 nsim_dev_port_add_all+0x53/0x150 drivers/net/netdevsim/dev.c:1452 nsim_drv_probe+0xd21/0x11c0 drivers/net/netdevsim/dev.c:1598 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x245/0xcc0 drivers/base/dd.c:596 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:752 Memory state around the buggy address: ffff88807690a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807690a400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807690a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807690a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807690a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================